@stuartl When I re-read your question I realized that you were saying you wanted to use the headless RasPI SSTV box. But no remote GUI protocol. Perhaps just run a TCP-IQ server on the RasPi? Send the IQ data to an app on your laptop/desktop? Something like Spyserver? That would avoid the remote gui protocol and its an off the shelf solution. 2/2
May 18, 2026, 7:52 PM@ChuckMcManis No, because `slowrxd` is running on the RPi4, if I did what you're suggesting there, I'd be sending the I/Q data off elsewhere to be decoded, then sending the decoded audio *back* to the RPi4 to demodulate the SSTV transmission.
Utterly pointless.
This is a headless station. There's no phone. There's no laptop. There's no desktop. There's no monitor. Just a radio, a RPi4, and an Internet connection. It hears a SSTV signal, it decodes it, it slaps it up on the Internet via the @vk4msl_sstv bot and throws the image up on a website.
Putting a second machine in only moves the problem, because the second machine will be headless like the first.
Ah got it. I went back and read your 'hacking sstv' web page. One answer is to just write a program that tunes your SDR to the band where the SSTV images are being transmitted, capture the transmission and decode them and then post them to the Fediverse. That all works fine on a headless RasPi with an SDR dongle and an internet connection.
It's interesting that few do it this way.
May 18, 2026, 8:53 PM@ChuckMcManis Yes, that is one way… my question was whether someone had written such a program, because the idea that I'm the first person in the world to want to do this seemed odd. Why re-invent the wheel?
Turns out, `rtl_fm` exists (as per @ai6yr 's post elsewhere in this thread). Not a 100% solution, but 90% of the way there.
May 18, 2026, 9:00 PM@ChuckMcManis @ai6yr Yes, and a tool named "rtl_*fm*" also sounds like it's for receiving Frequency Modulation signals, not Single Side-Band.
So it's a poorly named tool. I'd have called it `rtl_rx` or `rtl_demod`.
@stuartl @ai6yr
LOL. Yeah, but I would bet you a donut that in the initial commit of the code all it did was demodulate WBFM and then someone said, "Well it could also do ..." and that got added on. You could hack it to also demodulate SSTV and add a switch to tell it to produce .png files or something and the cycle would continue. 😆